 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  * Bjorn Freeman-Benson - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.variables;

 import java.net.URL ;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.variables.IDynamicVariable;
 import org.eclipse.core.variables.IDynamicVariableResolver;
 import org.eclipse.osgi.service.datalocation.Location;

 /**
  * Resolver for ${eclipse_home}
  *
  * @since 3.2
  */
 public class EclipseHomeVariableResolver implements IDynamicVariableResolver {

     public String resolveValue(IDynamicVariable variable, String argument) throws CoreException {
         Location installLocation = Platform.getInstallLocation();
         if (installLocation != null) {
             URL url = installLocation.getURL();
             if (url != null) {
                 String file = url.getFile();
                 if (file.length() != 0) {
                     return file;
                 }
             }
         }
         return null;
     }

 }

